Art of forming plates for artificial teeth.



E. A. HUSSAR. ART OF FORMING PLATES FOR ARTIFIClAL TEETH.

APPLICATION FILED APR. 1, 1916.

Patented Jan. 9, 1917.

2 $HEETS-SHEET 1.

@51 -04 Gttozw:

MZMEJS T 7 @513 m atfozmct E. A. HUSSAR.

ART OF FORMING PLATES FO-R ARTlFlClAL TEETH.

APPLICATION FILED APR. 1, 19l6.

1,211,944. 4 Patented Jan.9,1917;

2 snEET's-sHEET 2.

UNITED STATES ERNEST A. HUSSAR, OF NEW- YORK, N. Y.

ART OF FORMING PLATES FOR ARTIFICIAL TEETH.

To all whom it may concern.-

Be it known that I, ERNEST A. HUSSAR, a subject of the Emperor of Austria-Hungary, residing at New York city, county of the Bronx,and Stat of New York, have invented certain new and useful Improvements in the Art of Forming Plates for Artificial Teeth, of which the following is a full, clear, and exact description.

This invention relates to the art of forming platesv for artificial teeth, that is to say, plates supporting false teeth, and also to an element which I employ, when forming the plates, arranged to obviate the necessity of carving or finishing off the plates after they have been taken from the. mold.

As is well known, the rubber plates that support false teeth are formed in'a suitable mold and vulcanized. After the rubber plate has hardened, it is taken from the mold and carved or dressed up, the carving being necessary because the surface of the rubber is rough when the plate is taken from the mold owing to the fact that the mold surfaces are usually comparatively rough. Much time is, therefore, ordinarily spent in carving or dressing up the rubber plates after they have been taken from the mold, and one of the objects of my invention is to obviate the necessity of carving the plates, thereby saving a great amount of time and also providing a more accurate simulation of the natural teeth.

40 out my improvement; Fig. 2 is a similar sald trial or setting-up plate and teeth;

I will now proceed to describe my invention n detail, the essential features 6f which will be summarized in the appended claim, reference being had to the accompanying drawings, forming'part hereof, wherein:

Figure 1 is a perspective View of one of the squeegee-plates employed in carrying view of another one of my. squeegee-plates; Fig. 3 is a perspective view of a trial or setting-up plate and teeth therein having thesqueegee-plates of my improvement applied thereto; Fig. 4: is a front elevation of Fig. 5'is a diagrammatic sectional view of a flask illustrating one of the steps inthe art of forming my plates; and Fig. 6 is a "similar view of another step in the manu-' facture thereof.

My invention consists in utilizing, in

combination with the. present method 'of.

forming plates, a plurality of preshaped squeegee plates which act not only to pro- I Specification of Letters Patent.

per or lower jaw,

Patented J an. 9, 1917.

Application filed April 1, 1916. Serial N 0. 88,200.

duce a smooth surface but also to give a more natural appearance to that portion of the plate adjacent the teeth or gums.

My improved squeegee-plates are preferably made out of pliable metal, such as soft tin, and are preshaped to conform to a perfeet mouth; in other words, the plates are previously shaped to conform to the shape of a perfect or natural mouth-that is to say, a perfect set of teeth and gums and consequently when applied to the settingup plate with a set of false teeth, will provide a surface that is an exact duplicate form of a perfect set of gums. What I term the trial or setting-up plate, is a wax plate formed on a cast taken from the upthe false teeth being set up in the Wax plate to suit conditions. My

improved squeegee-plates are applied to that is applied to the outer gum-surface of the said setting-up plate, also shown in Fig.

The plate 1 is provided with a series of serrations 4, and the plate 3 with a series of serrations 5, the serrations 4 and 5 being positioned opposite the teeth 6 in the trial or setting-up plate 2. The said serrations are spaced to correspond to the spacing of a perfect set of teet When. the plates 1 and 3 are placed upon the trial or settingup plate, the projections or points 7 will be located in the crevices 8 between theteeth, or nearly so. After the squeegee plates have been applied to the wax trial plate, the wax plate is' heated slightly to cause the said squeegee plates to adhere thereto.

Myv improvement is a step in the art of forming artificial plates, provided with teeth, the said step being the utilization of the said squeegee plates for the purposes described.

As is well known, a wax impression is taken of the mouth from which the settingup or trial plate 2 is formed, the teeth being set up in the trial plate to suit the conditions of the mouth. The trial plate is then set in a flask, such a flask being indicated by 9 in Figs. 5 and 6, the flask consisting of the separably connected members 10 and 11. After the trial plate has been'positioned in the flask, plaster is poured in and allowed to set. After the plaster has set, the wax trial plate is melted and allowed to run out, leaving a core the shape of the trial plate in the flask. After the wax trial plate has been melted out, the core is filled with rubber and the rubber vulcanized. I When the flask members are separated, the rubber plate is removed. After the plate has .been removed, it must be carved or finished along the outer gum surface as said surface will be rough due to the impossibility of making a perfect core. This operation requires considerable time and skill which is saved by the utilization of my improvement or squeegee plates 1 and 3.

As has been stated the squeegee plates are previously formed and applied to the trial plate after which the trial plate and squeegee plates, carried thereby, are placed in the flask and surrounded by plaster the same as usual. When the wax trial plate has been melted out, the core will have the appearance indicated in Fig. 6. The squeegee plates being anchored to the plaster indicated by 12 and 13. 7 When the rubber is placed inthe core 14, Fig. 6, it will encounter the squeegee plates 1 and 3, instead of the plastergwhich have a perfectly shaped smooth surface. The plates land 3 prevent the rubber from soaking into the plaster along the outer gum surface and roof surface of the core, an action-which happens in the ordinary mold; hence the roughness referred to. The plates 1 and 3 also confine the gases generated by the vulcanizing process, hence a much harder and also a thinner rubber plate can be formed than with the present method. a

To anchor the plates 1 and 3 to the plaster, in order to hold them after the wax has been melted out, I provide each plate 1 and 3 with anchors 15 which will be engaged by the plaster in the flasks. After the finished rubber plate has been removed from the flask, it will be ready for use without the necessity ofbeing carved. An illustration of the minute formations of the month have been omitted but it will be understood that the plates 1 and 3 will be formed with all of the said minute formations. By careful manipulation, the plates 1 and 3 may be used several times as they can be removed from the plaster after the rubber plates have been removed. I

While I have illustrated a set of teeth and plate for the upper jaw, it will be understood that the same process will take place to form a set of teeth for the lower jaw.

Having now described my invention, what I claim and desire to secure by Letters Patent, is:

The process of preparing dental plates, consisting first, in making a trial plate of plastic material approximately corresponding to the human jawwhich is to be treated and to the neighboring interior part of the mouth; secondly, in molding on the inner surface of the human gums in this jaw and the neighboring part of the interior of the mouth a thin plate of flexible metal adapted to take exactly the form of the human surface and molding on the outer surface of the gums a narrow plate of like material; and

thirdly, applying these thin plates thus molded to the corresponding surfaces of the trial cast so as to transfer to them the exact impression of the human surfaces, thus completing a trial plate from which the final rubber setting may be made.

Signed at New York city, N. Y., this 31 day of March, 1916.

ERNEST A. HUSSAR. 

